New: Intermittent TCP issues with => 2.6.27
Subsystems (2)
Begin forwarded message:
Date: Mon, 29 Dec 2008 18:52:40 -0800 (PST)
From: [email protected]
To: [email protected]
Subject: [Bug 12327] New: Intermittent TCP issues with => 2.6.27
http://bugzilla.kernel.org/show_bug.cgi?id=12327
Summary: Intermittent TCP issues with => 2.6.27
Product: Networking
Version: 2.5
KernelVersion: 2.6.27
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: IPV4
AssignedTo: [email protected]
ReportedBy: [email protected]Latest working kernel version: 2.6.26.8
Earliest failing kernel version: 2.6.27
Distribution: Ubuntu
Hardware Environment: amd64, KVM
Software Environment:
Problem Description:
As reported in LP #296767
(https://bugs.launchpad.net/ubuntu/+source/linux/+bug/296767) I am experiencing intermittent TCP issues over a PPP ADSL2+ connection with the only change being an upgrade to 2.6.27.
A number of websites, ping, traceroute work correctly but I simply can't connect to several including:
- store.apple.com
- youtube.com
- ANZ internet banking (anz.com.au)
- MSN messenger
I have also tried compiling a generic 2.6.28-rc4 kernel and this still suffers from the same issue, however if I reboot into the previous Ubuntu kernel (2.6.24) or a vanilla 2.6.26 kernel the issue disappears.
Steps to reproduce:
1. Use a KVM guest as a gateway to a PPP internet connection
2. Boot with kernel <= 2.6.26
3. Observe functioning networking
4. Boot into 2.6.27+
5. Observe broken networking
Signature · 3 lines
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Quoted 8 lines · Stephen Hemminger
A number of websites, ping, traceroute work correctly but I simply can't connect to several including:
- store.apple.com
- youtube.com
- ANZ internet banking (anz.com.au)
- MSN messenger
I failed to reproduce this on 2.6.28-rc9. I even used the same IP address as shown in your pcap file, 17.149.156.10.
In fact, your pcap file shows that the two kernels produce almost exactly the same content in the TCP headers. The only material difference was the window size, which differed by 32 bytes.
So I'd suggest you take a look at other nodes on the path between you and those websites, or try turning things such as window scaling off.
Cheers,
Signature · 4 lines
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <[email protected]>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txtQuoted 5 lines · Herbert Xu
Quoted 4 lines · Stephen Hemminger
A number of websites, ping, traceroute work correctly but I simply can't connect to several including:
Quoted 7 lines
Quoted 4 lines
- store.apple.com
- youtube.com
- ANZ internet banking (anz.com.au)
- MSN messengerI failed to reproduce this on 2.6.28-rc9. I even used the same IP address as shown in your pcap file, 17.149.156.10.
Same for me, though I don't have ppp in the setup like he does (see the mail in the other thread).
Quoted 3 lines
In fact, your pcap file shows that the two kernels produce almost exactly the same content in the TCP headers. The only material difference was the window size, which differed by 32 bytes.
Yeah, nothing wrong with tcp/ip side.
Quoted 3 lines
So I'd suggest you take a look at other nodes on the path between you and those websites, or try turning things such as window scaling off.
He did already turn things off without any success, the original report for ubuntu is at:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/296767
I doubt that the original reporter received this mail anyway... There's another thread (fwd by Andrew) which has more content already.
Signature · 1 line
i.